SDS-Plus is the first in a long line of drill chucks that have been developed to be both easy-to-use and better in masonry applications than standard jawed chucks. The SDS-Plus chuck is often found on rotary hammers that are at the smaller end of the scale, but larger than your conventional hammer drill. The SDS mechanism makes it easier for the drill motor to transfer energy to the bit due to the fact that it only has to move the bit instead of the chuck in its entirety. These bits, chisels, and hammers are commonplace in a variety of different masonry application, but are often not as well suited to larger jobs as the SDS-Max and Spline counterparts.